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(PowerBuilder) Compute JWK Thumbprint for RSA and EC Public Keys

Demonstrates how to compute a JSON Web Key thumbprint for a public key (RSA or ECC).

Note: This example requires Chilkat v9.5.0.66 or greater.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_PubKey
oleobject loo_Sb
integer li_Success

loo_PubKey = create oleobject
li_rc = loo_PubKey.ConnectToNewObject("Chilkat_9_5_0.PublicKey")
if li_rc < 0 then
    destroy loo_PubKey
    MessageBox("Error","Connecting to COM object failed")
    return
end if

//  A public key can be loaded from any format (binary DER, PEM, etc.)
//  This example will load the public keys from JWK format,
//  and will then compute the JWK thumbprint.

//  First do it for an RSA public key...

loo_Sb = create oleobject
li_rc = loo_Sb.ConnectToNewObject("Chilkat_9_5_0.StringBuilder")

loo_Sb.Append("{")
loo_Sb.Append("\"kty\": \"RSA\",")
loo_Sb.Append("\"n\": \"0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx4cbbfAAt")
loo_Sb.Append("VT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMstn6")
loo_Sb.Append("4tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FD")
loo_Sb.Append("W2QvzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n9")
loo_Sb.Append("1CbOpbISD08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINH")
loo_Sb.Append("aQ-G_xBniIqbw0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw\",")
loo_Sb.Append("\"e\": \"AQAB\",")
loo_Sb.Append("\"alg\": \"RS256\",")
loo_Sb.Append("\"kid\": \"2011-04-29\"")
loo_Sb.Append("}")

//  The JWK format is automatically detected..
li_Success = loo_PubKey.LoadFromString(loo_Sb.GetAsString())
if li_Success <> 1 then
    Write-Debug loo_PubKey.LastErrorText
    destroy loo_PubKey
    destroy loo_Sb
    return
end if

//  Get the JWK thumbprint (using SHA256)
Write-Debug "JWK thumbprint: " + loo_PubKey.GetJwkThumbprint("SHA256")

//  Output:
//  JWK thumbprint: NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs

//  --------------------------------------------------------------
//  Now let's do an EC public key:
loo_Sb.Clear()
loo_Sb.Append("{ ")
loo_Sb.Append("  \"kty\": \"EC\",")
loo_Sb.Append("  \"crv\": \"P-256\",")
loo_Sb.Append("  \"x\": \"tDeeYABgKEAbWicYPCEEI8sP4SRIhHKcHDW7VqrB4LA\",")
loo_Sb.Append("  \"y\": \"J08HOoIZ0rX2Me3bNFZUltfxIk1Hrc8FsLu8VaSxsMI\"")
loo_Sb.Append("}")

li_Success = loo_PubKey.LoadFromString(loo_Sb.GetAsString())
if li_Success <> 1 then
    Write-Debug loo_PubKey.LastErrorText
    destroy loo_PubKey
    destroy loo_Sb
    return
end if

//  Get the JWK thumbprint (using SHA256)
Write-Debug "JWK thumbprint: " + loo_PubKey.GetJwkThumbprint("SHA256")

//  Output:
//  JWK thumbprint: 8fm8079s3nu4FLV_7dVJoJ69A8XCXn7Za2mtaWCnxR4


destroy loo_PubKey
destroy loo_Sb

 

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